Tetrachloroethylene CAS 127-18-4

Tetrachloroethylene, also known as perchloroethylene (PERC), is a synthetic chemical with the CAS number 127-18-4. It is a non-flammable, colorless liquid that has a sweet, ether-like odor and is widely used in various industrial and commercial applications.
Uses of Tetrachloroethylene
Dry Cleaning: Tetrachloroethylene is primarily used as a solvent in the dry cleaning of fabrics. Its effectiveness in removing grease and stains makes it a popular choice in the textile industry.
Metal Degreasing: It is also utilized for degreasing metal parts, making it valuable in manufacturing and maintenance operations.
Chemical Intermediate: Tetrachloroethylene serves as a building block for the synthesis of other chemicals, contributing to its importance in chemical manufacturing.
Household Products: In addition to industrial uses, it can be found in various household products such as suede protectors, paint removers, and spot removers.
Health and Environmental Concerns
Tetrachloroethylene is recognized for its potential health risks. Long-term exposure has been associated with various health issues, including:
Carcinogenicity: The chemical is classified as “likely to be carcinogenic in humans by all routes of exposure” according to the EPA guidelines.
Exposure Risks: People may be exposed to tetrachloroethylene through inhalation of vapors, skin contact, or ingestion of contaminated water. It can evaporate into the air, leading to indoor air contamination, especially in homes where it is used in cleaning products.
Regulatory Standards: The state and federal drinking water standards for tetrachloroethylene are set at 5 micrograms per liter (µg/L), and residential indoor air action levels are recommended at 6 parts per billion by volume (ppbv) to protect public health.
Chemical Properties
Chemical Formula: Cl₂CCCl₂
Molecular Weight: 165.83 g/mol
Density: Approximately 13.5 lb/gal.
In summary, tetrachloroethylene is a widely used solvent with significant applications in dry cleaning and metal degreasing. However, its potential health risks necessitate careful handling and adherence to safety regulations.